Insulated fire box



Sept. 7 1926.

'1,599,103 G. K. scHLo'r-rERER lINSUIJTED FIRE BOX Filed June 26.

1925 2 Sheets-Sheet l llllll|| lllll lllll l INVENTOR W'ITNESSES sept. 7 1926.

G. K. SCHLOTTERER INs-ULATED FIRE BOX" Filed June 2e,

INVENTOR n 59923129. B1 amr.

2 Sheets-Sheet 2 WITNESSES Patented Sept. 7, 1926. A

` -adEonGEf-x. g primeira, unNNsYLvnNIA,Ass1GNoR *ro* nARBIsoN- A l .(:OMPNYZ OF"PIT.TSBURGH, TPEVNNSYLY-NIAPA .COR-

2034110.11401* rem-revente @This mentn' frentes" a l:brak ,ik-uns.

MOTe vpartici-i'laijly litf relates/to a sealf for the vious to p'assage'of-airfor gasesof corn-blustion therethrough."

partial central vertical section through a lstandarfd Vtype-fof`Ybrickkiln@and l oneio'f.: 4the vertical section through-fone f the'ire' boxes j into the Walls, with openings for firing from the outside ofthe kiln, and With means for Lthe ygases Vof combustion to pass upward from the lire box toward the `top of the kiln, and means yfor supplying air either by forced draft or induced draft Vunderneath the grate bars of the fire box, and means to draw olf thehot gases through thebottorn These structures are known of the kiln. n .as downdraft kilns.

is due to the passage into 4the kiln fromVv the 1 fireboxesoflair, or unburned fuel gases, or

' that takes place. The present invention.

both, through crevices in the inner Wall of the fire box, thus "cooling the bricks adjacent thereto', lorelse overheating them, ac-l cording to the particular" form of jleakage has for its objectl the prevention offsuch leakage through'the re box Wallinto thel kiln.

yReferring ytothe "drawings, andy particu-fy i larlyto Fig. 1--afstandard form. of'dovvndraft'kil vis yshown comprising a lfloor 1,V

an outer Wall .2, and a top 3.V A fire boxis illustrated in sectionin thisfigure, and it comprises `an air in-let 4, controlled by Va door'5, leading into anfashpit 6, above which 1 ,l y I` are l transverse gratebars' 7 4,adapted to sup- POY fuel in thel vcombu'stion-chainber 8. AV ldoorf-JE)t controls-. arlpassage l0 through @which fiiel #may be passed into the -coinbustion e :chamber 8. SA cheizker-Workllis` piovidedv f the' Wallsof? 'fire boxeso'f-brick kilnsimperabove? the combustion chamber, fand through itli hot 'gases passtr :upward 1in-to 4Lthe. kiln, to- Y y f ffwardsthetopfthereofpand/then.-aredrawn Referring gtlfthel'drawings UF ig. 1 -is a cttw/through iiuefpassaiges '.12 infftheffloor,

thenkiln.i V-Qp'eningsffl are provi'ded in'the floor,1.lea^ding #down-finto the passages w12, through Whichi the hot gases 'are drawn olf vafteiliaving passed upward finto` the Akiflzn` r.and fdownivard; around the "bricks fbeing burned, as Will be thoroughly7l understood'by those familiar with this art.

y InfFigswo', 'ilaindg easuppleinentary air VAsupplyj'aziipe 16- is .-s'ho'avn, andr this vlnay be fused .fori a forced'v fdraft.- system: in .which Iair under pressure is supplied beneath the grate bars 7. The particular method of supplying air for combustion is not a part of this invention,Y which is applicable to forced draft, induced draft, or to natural draft. It Will, however, be understood that in forced or induced draft there is a greater tendency toward leakage of air from the fire box directly into Vthe kiln. This tendency increases as the Walls of the fire box be comev cracked by repeated heating and cooling in use, as will be readily understood.

The present invention consists in dividn 'ing-the three inner Walls of the fire box into separate portions 20, and 21, with an intermediate space Y22 `extending coextensive With the'inner Walls of the fire box, as clearly shovvnl in Figs. 2 and 3. Near the top the space 22 is partially closed, leaving feed openings 23extending to the top of the Walls 20' and 21. See Fig. 2.

The space 22 around the vinner Wallof'the Iirebox is illedwith sand, or other similar finely powdered, non-infl`annnable, closepackingmaterial," as illustrated in Figs. l,

therefore prevents the Vspoiling' or unequal burning of a material number ofl bricks ininiediatelyadjacent to thev fire boxes, in the burningfprocess.. VIt also'results in bricks VIt 'has' beenfoundV that this seal in theV Wall of the fire box prevents leakage of gas vor airtherethroughinto thebrick kiln, and

of uniform coloringbeing made, and 4has very distinct advantages in the operation of this kiln. In addition a material saving of fuel results. It has been found with the irebox walls sealed or insulated in this way that a charge of bricks can be burned in materially less time and with materially less fuel than with uninsulated, or unsealed lireboxes. In addition, bricks adjacent the fireboxes that were Jformerly damaged are now burned uniformly with those in other parts of the kiln.

The sand may be replenished through the openings 23, as it becomes packed down, or as it is dissipated into the cracks or crevices that develop in the lire box walls. Material non-granular in form might be equally eilicient as a seal or insulator for a time, but granular material is preferred because it is self-conforming to the space to be illed, it readily ilows into any new cracks or holes that develop, and as a body it cannot itself develop cracks or holes due to expansion and contraction due to changes of temperature. I prefer sand because it is universally available, cheap, dense and non-caking as well as heat resistant Within the temperatures here involved.

I claim 1. A. lirebox construction comprising an inner and an outer 'irebox wall with a space between, said space being filled with powdered non-inflammable material for the prevention of escape of gases through the wall.

2. A firebox construction for brick kilns, comprisingan inner and an outer firebox wall with a space between, said space being filled with sand for the prevention of escape of gases through the wall.

3. Ina brick kiln comprising a firebox built into the wall thereof, a seal for insulating` the lire box from the main chainber of the kiln, comprising a vertical body oi' sand positioned in the wall of the lirebox.

In a brick kiln comprising a lirebox built into the wall thereof, a seal 'for insulating the lirebox Jfrom the main chamber of the kiln, comprising a vertical body ot linely divided non-inflammable material positioned in the wall of the fire box.

5. A firebox for brick kilns, comprising a combustion chamber, a lateral wall sepa- 4rating said chamber from the interior of the kiln, said wall being vertically divided to form an intermediate space partially sur rounding the combustion chamber, said space being filled with drv powdered material adapted to prevent passage of gas from the Firebox to the interior of the kiln through the lateral walls of the irebox.

In testimony whereof, I sign my name.

GEORGE K. SCI'ILOTTERER. 

